Brake hydraulic station for high-speed shaft of wind driven generator with double energy accumulators

Abstract

The utility model provides a double-energy-accumulator wind driven generator high-speed shaft brake hydraulic station which comprises a hydraulic oil tank, a liquid level meter, an integrated valve block, a hydraulic pump, a motor, an overflow valve, a one-way valve, a manual pump, a throttling valve, an electromagnetic valve, an air filter, a filter, a first energy accumulator, a second energy accumulator, a pressure gauge, a pressure switch and an electrical junction box. The hydraulic pump, the motor, the overflow valve, the one-way valve, the manual pump, the throttling valve, the electromagnetic valve, the filter, the first energy accumulator, the second energy accumulator, the pressure gauge and the pressure switch are all arranged on the integrated valve block, are all connected to the electrical junction box and are all connected to an oil way between an oil inlet of the high-speed shaft clamp and the hydraulic oil tank. The high-speed shaft brake hydraulic station of the double-energy-accumulator wind driven generator is high in integration level, small in size, convenient to install and maintain and easy to clean, the shaking amplitude of the wind driven generator during braking is small, and the service life of the high-speed shaft brake clamp and the service life of the high-speed shaft brake disc are prolonged.

Description

Technical Field

[0001] The utility model relates to the field of wind turbines, and particularly to a high-speed shaft brake hydraulic station for a double accumulator wind turbine. Background Art

[0002] The traditional high-speed shaft brake hydraulic station of a wind turbine is a single accumulator hydraulic station, which does not have the delay performance for establishing the brake pressure of the high-speed shaft clamp during braking. This often causes a large amplitude of shaking of the wind turbine during braking. At the same time, since the braking of the high-speed shaft of the traditional wind turbine is almost completed instantaneously, this results in a strong impact on the high-speed shaft clamp at the moment of braking. Over time, the service life of the high-speed shaft clamp is reduced. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the defects of large shaking amplitude during braking of the existing wind turbine and short service life of the high-speed shaft clamp, and to provide a high-speed shaft brake hydraulic station for a double accumulator wind turbine.

[0004] The utility model solves the above technical problem through the following technical solutions:

[0005] The utility model provides a high-speed shaft brake hydraulic station for a double accumulator wind turbine, which is characterized in that it includes a hydraulic oil tank, a liquid level gauge, an integrated valve block, a hydraulic pump, a motor, an overflow valve, a check valve, a manual pump, a throttle valve, a solenoid valve, an air filter, a filter, a first accumulator, a second accumulator, a pressure gauge, a pressure switch, and an electrical junction box. The liquid level gauge and the air filter are both arranged on the hydraulic oil tank and communicate with the inside of the hydraulic oil tank. The electrical junction box is arranged outside the hydraulic oil tank. The integrated valve block is arranged above the hydraulic oil tank. The hydraulic pump, the manual pump, the air filter, and the filter are all communicated with the inside of the hydraulic oil tank. The hydraulic pump, the motor, the overflow valve, the check valve, the manual pump, the throttle valve, the solenoid valve, the filter, the first accumulator, the second accumulator, the pressure gauge, and the pressure switch are all arranged on the integrated valve block, all wired to the electrical junction box, and all connected to the oil path between the oil inlet of the high-speed shaft clamp and the hydraulic oil tank.

[0006] Preferably, the pressure gauge includes a first pressure gauge and a second pressure gauge, the overflow valve includes a first overflow valve and a second overflow valve, the check valve includes a first check valve and a second check valve, the oil path of the oil inlet of the high-speed shaft clamp includes a first oil path, a second oil path, and a third oil path, and the solenoid valve includes a first solenoid valve and a second solenoid valve;

[0007] The second accumulator, the first pressure gauge, the first solenoid valve, the first pressure switch, the second pressure gauge, the second accumulator, the first check valve, the filter, and the hydraulic pump are sequentially arranged on the first oil path. The inlet and outlet of the first relief valve are respectively communicated with the outlet of the hydraulic pump and the inlet of the throttle valve. The inlet of the hydraulic pump is communicated with the hydraulic oil tank;

[0008] The second pressure switch, the second solenoid valve, and the throttle valve are sequentially arranged on the second oil path. The inlet of the throttle valve is communicated with the hydraulic oil tank;

[0009] The second check valve and the manual pump are sequentially arranged on the third oil path. The inlet of the second check valve is communicated with the outlet of the manual pump. The outlet of the second check valve is communicated with the oil inlet of the high-speed shaft clamp. The two ends of the second relief valve are communicated with the two ends of the manual pump. The inlet of the manual pump is communicated with the hydraulic oil tank.

[0010] Preferably, the high-speed shaft brake hydraulic station of the double-accumulator wind turbine further includes a main control cabinet, which is used to receive the signals of the first pressure switch and the second pressure switch and respectively control the motor to stop and the wind turbine to start according to the signals of the first pressure switch and the second pressure switch;

[0011] When the pressure value of the second pressure gauge is 100 bar, the first pressure switch sends a signal to the main control cabinet, and the main control cabinet controls the motor to stop working;

[0012] After braking, the high-speed shaft clamp releases pressure. When the pressure in the high-speed shaft clamp is lower than 10 bar, the pressure value of the first pressure gauge is lower than 10 bar, the second pressure switch sends a signal to the main control cabinet, and the main control cabinet controls the release of the main shaft locking signal of the wind turbine and controls the wind turbine to start.

[0013] Preferably, both the first accumulator and the second accumulator adopt piston-type accumulators, and the nitrogen charging pressures of the first accumulator and the second accumulator are different.

[0014] Preferably, the nitrogen charging pressure of the first accumulator is 45 bar, and the nitrogen charging pressure of the first accumulator is 5 bar.

[0015] Preferably, the surface paint film thickness of the motor, the first accumulator, and the second accumulator is greater than 220 μm.

[0016] Preferably, the pressure building time of the high-speed shaft clamp during braking of the high-speed shaft brake hydraulic station of the double-accumulator wind turbine is 25 - 30 s.

[0017] Preferably, the integrated valve block is made of cast aluminum with an anodized surface treatment, and the pressure switch is made of stainless steel.

[0018] Preferably, the surfaces of the overflow valve, the check valve, the manual pump, the throttle valve, and the solenoid valve are treated with zinc-nickel plating.

[0019] Preferably, the double accumulator wind turbine high-speed shaft brake hydraulic station further includes a first accumulator backplate and a second accumulator backplate. The first accumulator backplate and the second accumulator backplate are vertically arranged above the integrated valve block, and the first accumulator and the second accumulator are respectively connected to the first accumulator backplate and the second accumulator backplate.

[0020] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0021] The positive and progressive effects of the present invention are as follows: In the present invention, each hydraulic component in the double accumulator wind turbine high-speed shaft brake hydraulic station is integrally installed on the integrated valve block, which can realize functions such as energy storage of the hydraulic system, braking of the hydraulic system, pressure holding of the hydraulic system during braking, and pressure relief of the hydraulic system during braking. It has the advantages of high integration, small volume, convenient installation and maintenance, easy cleaning, and convenient use. The braking time of the double accumulator wind turbine high-speed shaft brake hydraulic station is 25 - 30 s, which can convert the process of the brake disc of the wind turbine high-speed shaft being clamped by the high-speed shaft brake caliper from a sudden change process to a gradual change process. This not only increases the braking stability, reduces the vibration of the wind turbine body caused by braking, but also improves the service life of the wind turbine high-speed shaft brake disc and the high-speed shaft brake caliper, and has a relatively broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective structural schematic diagram of the double accumulator wind turbine high-speed shaft brake hydraulic station of the present invention.

[0023] Figure 2 It is another perspective structural schematic diagram of the double accumulator wind turbine high-speed shaft brake hydraulic station of the present invention.

[0024] Figure 3 It is still another perspective structural schematic diagram of the double accumulator wind turbine high-speed shaft brake hydraulic station of the present invention.

[0025] Figure 4 It is a schematic diagram of the principle of the double accumulator wind turbine high-speed shaft brake hydraulic station of the present invention.

[0026] Description of the reference numerals:

[0027] Hydraulic oil tank 1

[0028] Integrated valve block 2

[0029] Level gauge 3

[0030] Hydraulic pump 4

[0031] Motor 5

[0032] Overflow valve 6

[0033] First overflow valve 61

[0034] Second overflow valve 62

[0035] Check valve 7

[0036] First check valve 71

[0037] Second check valve 72

[0038] Manual pump 8

[0039] Throttle valve 9

[0040] Solenoid valve 10

[0041] First solenoid valve 101

[0042] Second solenoid valve 102

[0043] Air filter 11

[0044] Filter 12

[0045] First accumulator 13

[0046] Second accumulator 14

[0047] Pressure gauge 15

[0048] First pressure gauge 151

[0049] Second pressure gauge 152

[0050] Pressure switch 16

[0051] First pressure switch 161

[0052] Second pressure switch 162

[0053] Electrical junction box 17

[0054] Accumulator mounting block 18

[0055] First accumulator backplate 19

[0056] Second accumulator backplate 20

[0057] First hoop 21

[0058] Second hoop 22

[0059] The first oil circuit 100

[0060] The second oil circuit 200

[0061] The third oil circuit 300

[0062] The oil inlet 400 Specific embodiments

[0063] The present invention will be more clearly and completely described below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments

[0064] The present invention discloses a high-speed shaft brake hydraulic station for a double accumulator wind turbine, as Figures 1-4 shown, which includes a hydraulic oil tank 1, a liquid level gauge 3, an integrated valve block 2, a hydraulic pump 4, a motor 5, a relief valve 6, a check valve 7, a manual pump 8, a throttle valve 9, a solenoid valve 10, an air filter 11, a filter 12, a first accumulator 13, a second accumulator 14, a pressure gauge 15, a pressure switch 16, and an electrical junction box 17. The liquid level gauge 3 and the air filter 11 are both arranged on the hydraulic oil tank 1 and communicate with the inside of the hydraulic oil tank 1. The electrical junction box 17 is arranged outside the hydraulic oil tank 1. The integrated valve block 2 is arranged above the hydraulic oil tank 1. The hydraulic pump 4, the manual pump 8, the air filter 11, and the filter 12 are all communicated with the inside of the hydraulic oil tank 1. The hydraulic pump 4, the motor 5, the relief valve 6, the check valve 7, the manual pump 8, the throttle valve 9, the solenoid valve 10, the filter 12, the first accumulator 13, the second accumulator 14, the pressure gauge 15, and the pressure switch 16 are all arranged on the integrated valve block 2, all wired to the electrical junction box 17, and all connected on the oil circuit between the oil inlet 400 of the high-speed shaft clamp and the hydraulic oil tank 1.

[0065] Specifically, the hydraulic oil tank 1 and the liquid level gauge 3 are connected by bolts. The function of the liquid level gauge 3 is to observe the amount of oil in the tank. The hydraulic oil tank 1, the hydraulic pump 4, and the motor 5 are fixedly installed on the integrated valve block 2 by bolts. The hydraulic pump 4 and the motor 5 are mechanically connected by a coupling. The characteristic of such a connection is that the bell housing used when the normal motor 5 and the hydraulic pump 4 are connected is omitted. The first accumulator 13 and the second accumulator 14 are respectively installed on the accumulator mounting block 18. Hydraulic components such as the manual pump 8, the solenoid valve 10, the filter 12, the overflow valve 6, the check valve 7, and the throttle valve 9 are screw-in type. The use of screw-in type components can improve the compactness of the hydraulic station, reduce the volume of the hydraulic station, and reduce the mass of the hydraulic station, and has the characteristics of beauty, reliability, and durability. The air filter 11 is directly installed on the integrated valve block 2. The air filter 11 mounting hole of the integrated valve block 2 is a through hole. The function of this through hole is to connect the atmosphere with the oil tank, and the function of the air filter 11 is to filter the air leading to the hydraulic oil tank 1 from the external environment to prevent dust and other particulate matters from entering the hydraulic oil tank 1.

[0066] In this embodiment, the pressure gauge 15 includes a first pressure gauge 151 and a second pressure gauge 152, the overflow valve 6 includes a first overflow valve 61 and a second overflow valve 62, the check valve 7 includes a first check valve 71 and a second check valve 72, the oil circuit of the oil inlet 400 of the high-speed shaft clamp includes a first oil circuit 100, a second oil circuit 200, and a third oil circuit 300, and the solenoid valve 10 includes a first solenoid valve 101 and a second solenoid valve 102;

[0067] On the first oil circuit 100, the second accumulator 14, the first pressure gauge 151, the first solenoid valve 101, the first pressure switch 161, the second pressure gauge 152, the second accumulator 14, the first check valve 71, the filter 12, and the hydraulic pump 4 are arranged in sequence. The inlet and outlet of the first overflow valve 61 are respectively communicated with the outlet of the hydraulic pump 4 and the inlet of the throttle valve 9. The inlet of the hydraulic pump 4 is communicated with the hydraulic oil tank 1;

[0068] On the second oil circuit 200, the second pressure switch 162, the second solenoid valve 102, and the throttle valve 9 are arranged in sequence. The inlet of the throttle valve 9 is communicated with the hydraulic oil tank 1;

[0069] On the third oil circuit 300, the second check valve 72 and the manual pump 8 are arranged in sequence. The inlet of the second check valve 72 is communicated with the outlet of the manual pump 8. The outlet of the second check valve 72 is communicated with the oil inlet 400 of the high-speed shaft clamp. Both ends of the second overflow valve 62 are communicated with both ends of the manual pump 8. The inlet of the manual pump 8 is communicated with the hydraulic oil tank 1.

[0070] Specifically, the first accumulator 13 and the second accumulator 14 are arranged in parallel on the first oil circuit 100. By arranging the first accumulator 13 and the second accumulator 14 in parallel at the oil inlet 400 of the high-speed shaft clamp, the purpose of indirectly increasing the cavity of the high-speed shaft brake clamp is achieved, and further, the pressure building time of the brake circuit during high-speed shaft braking is prolonged. The first solenoid valve 101 and the second solenoid valve 102 are both two-position normally open solenoid valves. The hydraulic oil circuit uses seamless steel pipes.

[0071] In this embodiment, the high-speed shaft brake hydraulic station of the double-accumulator wind turbine further includes a main control cabinet, which is used to receive the signals of the first pressure switch 161 and the second pressure switch 162 and respectively control the motor 5 to stop and the wind turbine to start according to the signals of the first pressure switch 161 and the second pressure switch 162;

[0072] When the pressure value of the second pressure gauge 152 is 100 bar, the first pressure switch 161 sends a signal to the main control cabinet, and the main control cabinet controls the motor 5 to stop working;

[0073] After braking, when the high-speed shaft clamp releases pressure, when the pressure inside the high-speed shaft clamp is lower than 10 bar, the pressure value of the first pressure gauge 151 is lower than 10 bar, the second pressure switch 162 sends a signal to the main control cabinet, and the main control cabinet controls the release of the main shaft locking signal of the wind turbine and controls the wind turbine to start.

[0074] Specifically, when the pressure of the hydraulic system (during the energy storage process and the braking process) is 100 bar, the first pressure switch 161 sends a signal, and the transmitted signal is sent to the main control cabinet of the wind turbine. After receiving the signal, the main control cabinet controls the motor 5 of the front hydraulic station to stop working. After braking, when the high-speed shaft clamp releases pressure, when the pressure inside the high-speed shaft clamp is lower than 10 bar, the pressure value of the first pressure gauge 151 is lower than 10 bar, the second pressure switch 162 sends a signal, and the transmitted signal is sent to the main control cabinet of the wind turbine. When the main control cabinet receives the transmitted signal, it controls the release of the main shaft locking signal of the wind turbine. At this time, the wind turbine can start normally.

[0075] Due to the setting of the hydraulic pump 4 and the manual pump 8, the hydraulic system can achieve electric braking and manual braking, that is, the high-speed shaft can be safely braked even when the wind turbine is in a power-off state, and the hydraulic system has five states.

[0076] (1) The energy storage state of the hydraulic system is that the first solenoid valve 101 is energized, the motor 5 starts, the hydraulic oil enters the first accumulator 13 for pressure storage, the pressure of the hydraulic system rises, and when the pressure of the second pressure gauge 152 is 100 bar, the first pressure switch 161 sends a signal, and the main control cabinet controls the motor 5 to stop. The function of the first check valve 71 is to prevent the hydraulic oil from flowing back to the hydraulic oil tank 1 in the reverse direction;

[0077] (2) The electric brake state of the hydraulic system is that the first solenoid valve 101 is de-energized and the second solenoid valve 102 is energized. At this time, the reading of the second pressure gauge 152 decreases. At the same time, the pressure of the first pressure gauge 151 rises, and the system pressure value is less than 100 bar. The first pressure switch 161 disconnects. At the same time, the main control cabinet controls the motor 5 to start again. After that, the pressures of the two pressure gauges 15, namely the first pressure gauge 151 and the second pressure gauge 152, rise simultaneously. The signal of the second pressure switch 162 disconnects. When the pressure values of the two pressure gauges 15, namely the first pressure gauge 151 and the second pressure gauge 152, reach 100 bar simultaneously, the first pressure switch 161 sends a signal again and the motor 5 stops again, and the high-speed shaft clamp completes the brake;

[0078] (3) The electric brake release state of the hydraulic system is that the throttle valve 9 is fully opened, the first solenoid valve 101 is energized, the second solenoid valve 102 is de-energized, the pressure of the first pressure gauge 151 returns to zero, the signal of the second pressure switch 162 closes, and the system resumes the energy storage state;

[0079] (4) In the manual brake state of the hydraulic system, close the throttle valve 9 and operate the manual pump 8. When the pressures of the two pressure gauges 15, namely the first pressure gauge 151 and the second pressure gauge 152, reach 100 bar, stop operating the manual pump 8. At this time, the high-speed brake clamp has completed the brake;

[0080] (5) In the manual brake release state of the hydraulic system, loosen the throttle valve 9, and the pressure readings of the two pressure gauges 15, namely the first pressure gauge 151 and the second pressure gauge 152, return to zero, and the manual brake is fully released.

[0081] In this embodiment, both the first accumulator 13 and the second accumulator 14 adopt piston-type accumulators, and the nitrogen charging pressures of the first accumulator 13 and the second accumulator 14 are different.

[0082] Specifically, the hydraulic station has two accumulators. The function of the first accumulator 13 is energy storage and pressure maintenance, and the function of the second accumulator 14 is delay pressure maintenance and equivalently increasing the effective volume of the high-speed shaft clamp, thereby prolonging the pressure build-up time of the brake.

[0083] In this embodiment, the nitrogen charging pressure of the first accumulator 13 is 45 bar, and the nitrogen charging pressure of the first accumulator 13 is 5 bar.

[0084] In this embodiment, the surface paint film thickness of the motor 5, the first accumulator 13, and the second accumulator 14 is greater than 220 um.

[0085] In this embodiment, the pressure build-up time of the high-speed shaft clamp during braking of the double-accumulator wind turbine high-speed shaft brake hydraulic station is 25 - 30 s.

[0086] Specifically, the establishment time of the brake pressure of the high-speed shaft clamp of the double-accumulator wind turbine high-speed shaft brake hydraulic station is 25 - 30 s. In this way, the process of the brake disc of the wind turbine high-speed shaft being clamped by the high-speed brake clamp can be transformed from a sudden change process to a gradual change process. Therefore, the impact between the high-speed shaft brake clamp and the high-speed shaft brake disc during the braking process can be greatly reduced, which not only increases the braking stability, but also reduces the vibration of the wind turbine body caused by braking, and at the same time improves the service life of the high-speed shaft brake disc and the high-speed shaft brake clamp of the wind turbine.

[0087] In this embodiment, the material of the integrated valve block 2 is cast aluminum with surface anodic oxidation treatment, and the material of the pressure switch 16 is stainless steel.

[0088] In this embodiment, the surfaces of the overflow valve 6, check valve 7, manual pump 8, throttle valve 9, and solenoid valve 10 are treated with zinc-nickel plating.

[0089] In this embodiment, the double-accumulator wind turbine high-speed shaft brake hydraulic station further includes a first accumulator back plate 19 and a second accumulator back plate 20. The first accumulator back plate 19 and the second accumulator back plate 20 are vertically arranged above the integrated valve block 2. The first accumulator 13 and the second accumulator 14 are respectively connected to the first accumulator back plate 19 and the second accumulator back plate 20. In this way of setting, the first accumulator 13 and the second accumulator 14 can be installed more stably and the working environment is stable. Two accumulator mounting blocks 18 can also be set. The accumulator mounting blocks 18 are connected to the side of the hydraulic oil tank 1. The first accumulator back plate 19 and the second accumulator back plate 20 are respectively connected to the two accumulator mounting blocks 18. This way is not easy to damage the integrated valve block 2. Annular first hoop 21 and second hoop 22 can also be set. The first hoop 21 and the second hoop 22 are respectively connected to the first accumulator back plate 19 and the second accumulator back plate 20, and are respectively sleeved at the middle length position outside the first accumulator 13 and the second accumulator 14. Of course, it can also be adjusted according to needs to further stabilize the installation.

[0090] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A double accumulator wind turbine high-speed shaft brake hydraulic station, characterized in that: It includes a hydraulic oil tank, a liquid level gauge, an integrated valve block, a hydraulic pump, a motor, a relief valve, a one-way valve, a manual pump, a throttle valve, a solenoid valve, an air filter, a filter, a first accumulator, a second accumulator, a pressure gauge, a pressure switch, and an electrical junction box. The liquid level gauge and the air filter are both arranged on the hydraulic oil tank and communicated with the hydraulic oil tank. The electrical junction box is arranged outside the hydraulic oil tank. The integrated valve block is arranged above the hydraulic oil tank. The hydraulic pump, the manual pump, the air filter, and the filter are all communicated with the hydraulic oil tank. The hydraulic pump, the motor, the relief valve, the one-way valve, the manual pump, the throttle valve, the solenoid valve, the filter, the first accumulator, the second accumulator, the pressure gauge, and the pressure switch are all arranged on the integrated valve block, are all wired to the electrical junction box, and are all connected to the oil circuit between the oil inlet of the high-speed shaft clamp and the hydraulic oil tank.

2. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The pressure gauge includes a first pressure gauge and a second pressure gauge, the relief valve includes a first relief valve and a second relief valve, the one-way valve includes a first one-way valve and a second one-way valve, the oil circuit of the oil inlet of the high-speed shaft clamp includes a first oil circuit, a second oil circuit and a third oil circuit, and the solenoid valve includes a first solenoid valve and a second solenoid valve; The first oil circuit is provided with the second accumulator, the first pressure gauge, the first solenoid valve, the first pressure switch, the second pressure gauge, the second accumulator, the first check valve, the filter, and the hydraulic pump in sequence, the inlet and outlet of the first relief valve are respectively connected to the outlet of the hydraulic pump and the inlet of the throttle valve, and the inlet of the hydraulic pump is connected to the hydraulic oil tank; The second oil circuit is provided with a second pressure switch, a second solenoid valve and the throttle valve in sequence, and the inlet of the throttle valve is connected to the hydraulic oil tank; The second one-way valve and the manual pump are sequentially arranged in the third oil circuit, the inlet of the second one-way valve is connected with the outlet of the manual pump, the outlet of the second one-way valve is connected with the oil inlet of the high-speed shaft clamp, the two ends of the second overflow valve are connected with the two ends of the manual pump, and the inlet of the manual pump is connected with the hydraulic oil tank.

3. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 2, characterized in that: The dual-accumulator wind turbine high-speed shaft brake hydraulic station also includes a main control cabinet, which is used to receive signals from the first pressure switch and the second pressure switch and control the motor to stop and the wind turbine to start according to the signals from the first pressure switch and the second pressure switch; When the pressure value of the second pressure gauge is 100 bar, the first pressure switch sends a signal to the main control cabinet, and the main control cabinet controls the motor to stop working; When the brake is over, the high-speed shaft clamp releases the pressure. When the pressure in the high-speed shaft clamp is lower than 10 bar, the pressure value of the first pressure gauge is lower than 10 bar, and the second pressure switch sends a signal to the main control cabinet. The main control cabinet controls the main shaft locking signal of the wind turbine to be released and controls the start-up of the wind turbine.

4. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The first accumulator and the second accumulator are both piston accumulators, and the nitrogen charging pressures of the first accumulator and the second accumulator are different.

5. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 4, characterized in that: The nitrogen filling pressure of the first accumulator is 45 bar, and the nitrogen filling pressure of the second accumulator is 5 bar.

6. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The surface paint film thickness of the motor and the first accumulator and the second accumulator is greater than 220um.

7. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The pressure building time of the high-speed shaft clamp pressure during braking of the dual-accumulator wind turbine high-speed shaft brake hydraulic station is 25-30s.

8. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The material of the integrated valve block is cast aluminum with anodized surface, and the material of the pressure switch is stainless steel.

9. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The surfaces of the overflow valve, the one-way valve, the manual pump, the throttle valve and the solenoid valve are subjected to zinc-nickel plating.

10. The double accumulator wind turbine high-speed shaft brake hydraulic station as claimed in claim 1, characterized in that: The dual-accumulator wind turbine high-speed shaft brake hydraulic station also includes a first accumulator back plate and a second accumulator back plate, the first accumulator back plate and the second accumulator back plate are vertically arranged above the integrated valve block, and the first accumulator and the second accumulator are respectively connected to the first accumulator back plate and the second accumulator back plate.

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